Which colony was established in 1665 when New Haven and Hartford came together?

The establishment of the colony in 1665 that resulted from the merger of New Haven and Hartford is Connecticut. The unification of these two settlements was a significant development in the early colonial history of New England, as it led to a more organized and cohesive governance structure in the region. Connecticut was characterized by its fertile land and the implementation of the Fundamental Orders in 1638, which is often cited as one of the first written constitutions in the Western tradition, outlining a framework for government.

The relevance of this historical context is crucial, as it illustrates the colonial practice of consolidation to foster stability and order within settlements. This merger gave rise to a stronger colony capable of addressing the needs of its growing population and responding to external pressures, such as conflicts with Native American tribes and other colonies.

The other choices represent different regions or colonies that did not form from a merger of New Haven and Hartford. Rhode Island, for instance, was established earlier in 1636 by dissenters from Massachusetts Bay Colony, while Maine and Vermont were also different historical regions not created from this specific combination. Understanding these details helps clarify why Connecticut is the accurate answer to this question.